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Heat treatment process for Q&P980 steel

A technology of Q&P980 and process, which is applied in the field of heat treatment process of Q&P980 steel, can solve the problems that the process parameters cannot be reasonably matched with each other, and achieve the effects of short heat treatment process time, good application prospects and low temperature

Inactive Publication Date: 2014-02-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the strength and plasticity of the steel produced by the industrial Q&P heat treatment process in the past are all less than 23000MPa%, which shows that the existing heat treatment process parameter values ​​cannot achieve a satisfactory effect, and the process parameters involved cannot be reasonably coordinated with each other. The optimized heat treatment effect has been achieved, therefore, the Q&P heat treatment process parameters still need to be explored

Method used

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  • Heat treatment process for Q&P980 steel
  • Heat treatment process for Q&P980 steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Derust and degrease the Q&P980 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0022] (1) Austenitization: heat the pretreated Q&P980 cold-rolled steel plate at 800°C for 5 minutes;

[0023] (2) Quenching: quickly cool down to 240°C after the heat preservation is over, and the heat preservation time is 8s;

[0024] (3) Partitioning: Partitioning after quenching, the partitioning temperature is between 380°C and the partitioning time is between 60s, and finally water quenching is carried out to obtain Q&P980 steel with enhanced performance. Its EBSD diagram and TEM diagram are as follows figure 1 with figure 2 It can be seen from the EBSD calculation software that the volume fraction of the FCC phase, that is, the retained austenite, is above 15%; from the TEM images, it can also be seen that a large number of film-like distributions and retained austenite between martensite laths.

[0025] After testing, its tensile strength is ...

Embodiment 2

[0027] Derust and degrease the Q&P980 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0028] (1) Austenitization: heat the pretreated Q&P980 cold-rolled steel plate at 820°C for 2 minutes;

[0029] (2) Quenching: quickly cool down to 230°C after the heat preservation is over, and the heat preservation time is 5s;

[0030] (3) Partitioning: Partitioning is carried out after quenching, the partitioning temperature is between 420°C and the partitioning time is between 30s, and finally water quenching is carried out to obtain Q&P980 steel with enhanced performance.

[0031] After testing, its tensile strength is 1054MPa, its elongation after fracture is 23.8%, and its strength and plasticity are 25085MPa%, which is much higher than that of traditional Q&P steel.

Embodiment 3

[0033] Derust and degrease the Q&P980 cold-rolled steel plate, and clean it to avoid uneven heating during heat treatment.

[0034] (1) Austenitization: heat the pretreated Q&P980 cold-rolled steel plate at 810°C for 3 minutes;

[0035] (2) Quenching: quickly cool down to 250°C after the heat preservation is over, and the heat preservation time is 10s;

[0036] (3) Partitioning: Partitioning is carried out after quenching, the partitioning temperature is between 400°C and the partitioning time is between 45s, and finally water quenching is carried out to obtain Q&P980 steel with enhanced performance.

[0037] After testing, its tensile strength is 1043MPa, its elongation after fracture is 24%, and its strength and plasticity are 25032MPa%, which is much higher than that of traditional Q&P steel.

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Abstract

The invention belongs to the technical field of heat treatment of materials, and particularly relates to a heat treatment process for Q&P980 steel. The heat treatment process for Q&P980 steel comprises the following specific steps that firstly, carrying out heat preservation on a Q&P980 cold-rolled steel plate subjected to pretreatment for 2-5 min at a temperature of 800-820 DEG C; then, after the heat preservation is completed, rapidly cooling the steel plate to 230-250 DEG C, carrying out heat preservation on the steel plate for 5-10 s, and after the steel plate is quenched, carrying out partitioning on the steel plate, wherein the partitioning temperature is 380-420 DEG C, and the partitioning time is 30-60 s; and finally, carrying out water quenching on the steel plate so as to obtain steel with a product of strength and elongation of 25000-25100 MPa % and a percentage elongation of 23.8-24%. According to the technical scheme of the invention, through the reasonable mutual cooperation of austenitizing, quenching and partitioning systems, the product of strength and elongation of the Q&P980 steel is improved.

Description

technical field [0001] The invention belongs to the technical field of material heat treatment, in particular to a heat treatment process of Q&P980 steel. Background technique [0002] In today's world, cars are inseparable from people's lives, but the problems of high energy consumption and high pollution caused by the use of cars have also emerged. As people pay more and more attention to environmental protection, resources and energy. There is an urgent need for cars to be lightweight. [0003] The main method to realize the lightweight of automobiles is to reduce the thickness of the steel plate, but for the plate steel for automobiles produced by the traditional process, reducing the thickness of the steel plate will have two major disadvantages, which cannot meet the production requirements. First, the strength of traditional steel with good plasticity is insufficient. As the thickness of the steel plate decreases, the anti-deformation ability of the car becomes wors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 王建军王炳权刘沿东刘春明孟庆格
Owner NORTHEASTERN UNIV
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